linux-kernel - Re: [syzbot] [udf?] general protection fault in d_splice

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Message-ID: <bcodvjvbdcv5xtwgf454feurvlg6nawmbhgb7tsyynigtlp7wz@kbnid2eeebnd>
Date: Thu, 6 Mar 2025 22:12:07 +0100
From: Jan Kara <jack@...e.cz>
To: syzbot <syzbot+a9c0867e4d1dd0c7ab19@...kaller.appspotmail.com>
Cc: amir73il@...il.com, asmadeus@...ewreck.org, brauner@...nel.org, 
	corbet@....net, eadavis@...com, ericvh@...nel.org, jack@...e.com, jack@...e.cz, 
	linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux_oss@...debyte.com, lucho@...kov.net, mjguzik@...il.com, 
	syzkaller-bugs@...glegroups.com, v9fs@...ts.linux.dev, viro@...iv.linux.org.uk, 
	willy@...radead.org
Subject: Re: [syzbot] [udf?] general protection fault in d_splice_alias

On Thu 06-03-25 01:04:03, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
> 
> commit 902e09c8acde117b00369521f54df817a983d4ab
> Author: Al Viro <viro@...iv.linux.org.uk>
> Date:   Mon Feb 3 21:16:09 2025 +0000
> 
>     fix braino in "9p: fix ->rename_sem exclusion"
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11d77078580000
> start commit:   69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d1a6d4df5fcc342f
> dashboard link: https://syzkaller.appspot.com/bug?extid=a9c0867e4d1dd0c7ab19
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=125d0eb0580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13a595f8580000
> 
> If the result looks correct, please mark the issue as fixed by replying with:
 
#syz fix: fix braino in "9p: fix ->rename_sem exclusion"

Not sure how 9p got into this but given where cause bisection landed this
makes a lot of sense.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR